color-tf/hsl2rgb.js

RGB, HSL, HSV, HWB and more color models convertors

'use strict';

var hsl2rgb = (h, s, l) => {
  if (s === 0) return [l, l, l]; // achromatic

  const q = l < 0.5 ? l * (1 + s) : l + s - l * s;
  const p = 2 * l - q;
  return [hue2rgb(p, q, h + 1 / 3), hue2rgb(p, q, h), hue2rgb(p, q, h - 1 / 3)];
};

function hue2rgb(p, q, t) {
  // private fn
  if (t < 0) t += 1;
  if (t > 1) t -= 1;
  if (t < 1 / 6) return p + (q - p) * 6 * t;
  if (t < 1 / 2) return q;
  if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
  return p;
}

module.exports = hsl2rgb;